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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f0c68dc12b738fac5aea5cd15ca55ab669edf166d6cf24cd273b907e312f0581' 
  AND token = 'G9VFfoFuxxA89xa3qrthUMcJtDREzDOZ+4ToIfLV5nI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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