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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d094fcd5456d901beac0248644fa5ed9a0554216f52f7f87de3c0dba0c5bac6' 
  AND token = 'e9dt91nbfDFlR9qL8mx2houYfvprfe5+OgVqh5UkISI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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