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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f9ac3d57a3b88c6303645ef793827f29f7777b3c0887281747df25ff641a34d' 
  AND token = '8iFAazufAFQm4iE699Aso3YM1nPSc53OXBPMbe12oqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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