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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd42d363c04bc5d0f8bfed9495d6888a5ec53ddd722b8086639669b3a6c95b837' 
  AND token = 'mz2UZKOAXWAvpr/uYfni4VTand19pY8DLv6kkR8RjAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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