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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '20647c3394bbccda47f3546e6656364ebc757cd37b4665234216cec43138648a' 
  AND token = '1vQARe/3+vaxw8v9FkaeXdNq9g3kVaZr63WRIKBi0iI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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