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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '694d590dcabb37893204797757728153f245b6191ec106906e901e3d69af6840' 
  AND token = 'HSKtNE6A7PYZMjskWYa9HaVzbJfTAlFr932rkHSRX4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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