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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e4be74667e6e59089235575c18a8b89dafa7b16923c49ab0ad6fc965ab7fb73' 
  AND token = 'NrylFSjc78vbUxQ/5NfY73Vjj5eBGDfZOzeM8eDlJTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}