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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '774523bb1eadda7b30266ceec2cdcdc720520bfbe42ae388e22ef641e9b8326f' 
  AND token = '00NzJdzheBJBj9m8oVe5vy2TJ5DqD2z8n0MMLc9VMX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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