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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e6543f462d7ec853056af5e1b506897b02c02e25a9c79423de2bf71ded3c525' 
  AND token = 'bQFwcwQ5XrcUJd1Qj5nT4sx+eQeexrO2qpSk8wxTWvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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