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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d2cbc8887d64b472ed9d9526f3085b188c0121f5672de7b595fdd9a11f3a627' 
  AND token = 'VFd6tL5MQG7pIEIlxn+kI1JKdaXbB7hHNd7fG7GYrhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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