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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '63559b74c2297017404fc65d3cead8a423c47f977b462e7d08e9408f1abf872e' 
  AND token = 'XKo4/qfn7w+o46Ra15zEs5b8XpiLA5+KmIpKjEGnd34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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