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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7481666aac1d1f9aa862652f651a6532898daf56d18ccbe9190c6782683f66d' 
  AND token = 'Xs4fjV9xXidyof5W+YdXd4wGQIY41NKTtutTto40cRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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