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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11be04f3569e560da4dffc3ee7a8737e3e7083851970964ec644efa0bfcace09' 
  AND token = 'c+D7wYWvGsHTjcyPEK5xquc1YyoJ57sjuaRHx1gKFm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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