SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '00b7476857dbf5d9dd7c7d4718f7961b0cc8e45cf2327ff3e9e92018fc3e8a5d' 
  AND token = 'eH064X7htYEsO+Z/zGIshp7ZSclsmHmDnhlQqj2sRs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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