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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec0794316a54836e738a7f3ded614bff13accf1c6d06bf718d55c68de28e8be6' 
  AND token = 'lk0mYWjPMMaTgm3MLEi+qhk1eZBH7yGJ+HMzySUGAyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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