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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '692ecdffac6463d69ac8cdf538ca7e3c2264d6105715c6510176c868d2b87c26' 
  AND token = 'v/FnLFf2XUtwCd2IA3wamWWSv3pRkW7h5I25X1mMljo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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