SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4475554117eaf32c2837836b82f552981630e4885a916fcc7d14d18ec50b9e07' 
  AND token = 'd1pOmm/2w5DjgdIpsSKS/JTfb/2YN5MIlPLwvIyzz4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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