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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b775f0d68e241f8fd9f49b9597f8a696236ada4ad2a484e5676a11beb981afe0' 
  AND token = 'iqjyLd6S4PgA5gO0AdKqFejd2HURAL40ha1p+Eki0NA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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