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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '874e29586a10540ac6ed1b45c56b7679054b001b6b8ec0a2b45cfb84c730da4d' 
  AND token = 'hdaqVvEpdYfYEgOK6oCrg9IHjd9cK5XxJAhTUFJX5Co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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