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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0bf87e13e1abec9a8d1380c2a58e4f61338a04fd4c6d50c0d6e4f64a7d07a9c1' 
  AND token = 'QhvGS26w8NL/1A4u8cJ4DMRzr+jDODlssbcLza3vTr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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