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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '05b110fa7482a235ee5b7a27dd3c438620890f432ff86c7c83dfab991b30512c' 
  AND token = 'DEUj6ZfUiMoxD1bfanHTpgKFBn8YqrpU72ediMbxIjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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