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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '303263ef1839bba2c33fb22d1e2a90e0527f96595e83de1ec4790a7a168feab5' 
  AND token = 'JanEHEj/hYAMOAVPECZzmt1INb22kuIRne0rJbpPudc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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