SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '49605429abb44851e3d997e4828d675562ff8cccfc48a34221b6d87915f7a29f' 
  AND token = 'hYsz3hhxasOTXXu56LSG3en8fWC2A4GRVTgZgRRR8qU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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