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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '35d36531113208e1e2468792e699fe5eaee53e037ad2566f5ea8269949c0241c' 
  AND token = 'erhxNKAlLmW1R/0M+ySSiF0lX+1PU2xkCK5kKzCx5hI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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