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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7528cb15e4a28cce9c107be141131af5b6219eace6ce507c8ef70f4286ff211f' 
  AND token = '3j9TtRKtGGWVHya7kp4n7MS525eM7SsMUdW/docDW0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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