SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1147da64c4f3d0f9410759fe358209bfbcf3d42046bfaddaacf08ac6a467a265' 
  AND token = 'svYVLhqWDW1C1oYa6oHnizzZmY8KiosGzFbbndurS2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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