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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8588bd1836a19c78789b313b7fdd3599a5b99dd189d452a5f642db4d8c90791' 
  AND token = 'JuOdU7cEOotZ9zUX0tHJeENUAW4lGRhgDaY60i5Ryr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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