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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '281cfb48b3dfdc6398f0638f9415a3a487140d9691c243ec0553b98181d135b5' 
  AND token = 'YlfN40JXogHyT/Gam8uMJ+Uj6OaYGtdGxUoffR89JB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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