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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1752c533d8c3511716a0cdc65670af777a8a4e782bd84e7f6b5acc1e047dbef0' 
  AND token = 'L56AqWjBy+cN/lTy9sEgp0QUTcC457kEzT2wE4XVSrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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