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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4fb0196d99a845f8f1fd60ebcc4225481d9116f5fa3b77ebbbe3ced62867ac9f' 
  AND token = 'VAVJE2dbAHG+c6aE9P4SRixvniJXJ835ewLZQ/ehGOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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