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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f4d4a2dee9c2bf0ebb3d9bdc391fbb4bd146b10a2b011ca4d885c8b1deb571e' 
  AND token = 'B9lnkR0bWFlYR1VPRhNWUiSeaTfmVGBrgzPXVJ5AH3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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