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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '247b6ef4439566fa9b8ce8ca69825cf3f63ae014d51ace93c54fc8c2cfa546df' 
  AND token = 'y6a4HS0XYR1mvHF83JcHUhZo8izqtilhrecnTaN3hlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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