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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c04276dc13fdd2cb75f0a2460bb66e6a35f5f752bea66afa78d8db6e37e2e79' 
  AND token = 'RGCJYnglFnSw6lqZK7YLArmktxA1mYmnqAHPu5D4cdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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