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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '44afe2be49d417078f8c9ee1f8ff5455eb4b947bf80e379b2dd60e4b332bf5d7' 
  AND token = '/EY3obdcFNnnUu9rkwmi4kmkjPm1FFh+IiVgJefp+D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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