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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd18c3e42e6979a39c934259b96947bff20cc051fe0f9c8833ffb9052f89a2149' 
  AND token = 'm5tr8pizG4XmUub0EvERX0cJ+lxpoCfGgKOnYE5fHNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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