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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36fb8e0f8e0c4f71e49fe042fccad45b3e2e143cfabab90b3fb9c40c207a31ed' 
  AND token = 'DZnMZg6qJPcVTajTEcxa5UwFSPGt9MtZW2+FnNI1i+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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