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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67b1a77aa674d1852b30a6ffd7f29f51d0a7a02ed601e0bcbe3930e6130a05fd' 
  AND token = 'h1eg0/N6aVztmzY6agvLpPEep+kdiaFpp4xKDpW7apo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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