SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b8f64fe9e2df1954636ff2035fd67c2579b95c5f6bd75c3ba6235198644980d' 
  AND token = 'hXgSvdbSqFrIxSq6EdKmuA4zVNEPNQXp1mZnjuTvAlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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