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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '870fb6951fdcbe91a6425b3c2d255a82769772b8795f2ef0c25b6bd2ce3b85c8' 
  AND token = 'xvDFlSm3JZeXHXeXNlHtQASpy20WtqsMDhaufEtmTgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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