SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5cd47379b40db15c5be4ad0f64cfaae98f1938a40bb76affc1fb24d68cc97d76' 
  AND token = 'HOAA3jLuNFjgHKN2VhskVa+kGnatdvTkFnYwp8n5DZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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