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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1dee6e68253bc2445d0c7ee1814e9160531a382c571f642bb3a907617259fdb6' 
  AND token = 'ScgNPxCC84a8/p/zDFwQGhdaD7oGusfUk75y45GU9bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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