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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d96e9a56e76ddfa5dffb4274b8bf8645c109fd4dac3c5eb0af449b129e78bc6' 
  AND token = 'PM+7u7aCgReCCcfYKDuY/59En17Pckwn+LtxE8xRSPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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