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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e9fd4aff3561f4a3d252b1e9a885cfc36cd9ac3fff983f8db4e27ca19eb4dad8' 
  AND token = '2/D8KkU8xYMFDo0pJxn2c9Mav9WE3JcrMAgc6Wvf6t4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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