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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5a28b729eb935ff0f86d663615d70210a1907252413f0d50a89603243aff4d0' 
  AND token = '0FtV0ULmfrUVzKyHck96wYcpZkgRzcR9Xgz0XkKaroc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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