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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d7206535eef275b5497239759d6cae6d6255abef3552e57aa8a079707a56982' 
  AND token = 'gb+2fTLP+VaDQ6uG6uFyJMZyerP5VI2oqQhbGOrpIKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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