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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b19de58ccc900722abe30ff1eba7ec6971138a10ae715eae611c3d7781b572c' 
  AND token = 'F+oe7BgiVFyO6NPg0ExY3MPb6IJ87qIwTthdBlCnzlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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