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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2ff365ed1c2057aff122d0b25f2bb4b42035f1359e240f8da780580a53471e2' 
  AND token = 'R8qibt57XAYd4ssTVAS09O3tUvK9hKdx0WWQdbW0rCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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