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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '356263df95cb4724dd9885b5786b4af720c8db136363d84a40486ce760fad848' 
  AND token = 'oZ5sSLIl/dLIfMI7klYwNnDha83Ich0EwNlsQoGWhko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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