SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7960ac155cfd665c1dbc659118b14b08760870e04b2775c4508ea3c9f0d967b4' 
  AND token = 'EQ+NMnK49AL5f22vrwSIgV5Uz06Fmci3goUxLqFJQgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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