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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ea345d3ef9759ca25c07d4f2579feb75c4af95ef65d339fa50444acae1c9393' 
  AND token = 'F2Q/BYafYSbh7Mj233dWi6w+yEvJALM9gW02WJMj5u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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