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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e211e157a49f87d6ee2b5efc550679952eaaab94b796b17d641ad6b603467fce' 
  AND token = 'Q/4kECBW88q8zmH15im5JNY0XOgiapmNeesdaxK8LhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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