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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f4eef3022dc0713fcf9185f4f644446f057c1e77d8508c26606ef61f7c493633' 
  AND token = 'K5sGzzrZ09OmlyDwDaqez2efa2V412xEAyz3310UaaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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