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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03926faa6f49fca6fa78bbc5dd05322c64b44585425ddea526eab45e947fbd0d' 
  AND token = 'yIeIqfrt62C8xEC56WZjfj3Pr9ECK7hL5+H0swxVztA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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