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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91131090b40c1118c777a461af67cd72e9159ea4596b149e09d6165de9f98c8b' 
  AND token = 'Aaz4cU1gXYZ9pPOq8bMOW5BTHFG+sPQ/kbspU9DLY+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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